io6 The Irish Naturalisti May, 



Summary. 



The specimens I have described belong to the genns 

 SpiJithcr, and have a parapodial cirrns. 



They are distinguished from S. vuniacais by (i) the presence 

 of a cirrus; (2) size; (3) character of ventral surface ; (4) the 

 shape of the extruded pharynx ; (5) the absence of lateral 

 diverticula from the caecum : (6) the shape of the hooks 

 (fig. 10) ; (7) the shape of the lamellae. 



From S. arcticus my species is distinguished b}' (i) size; 

 (2) the presence of the cirrus ; (3) the number of segments. 



From V. Graffs S. oniscoides \t differs in (i) size; (2) number 

 of segments; (3) setae; (4) hooks ; (5) the shape of the mid- 

 gut and its diverticula. 



It agrees with Johnston's S. oniscoidcs in (i) size; (2) posses- 

 sion of a cirrus ; (3) (probably) setae ; and it comes from the 

 same localit}'. 



I consider that the points I have mentioned are sufficient 

 to distinguish my specimens and v. Graflf's as belonging to 

 different species. The difference in size, in number of 

 segments, in the shape of the hooks and setae, and in the 

 shape of the gut and diverticula, is, I think, sufficient to 

 differentiate them. Further, ni}' specimens correspond more 

 closel}' to Johnston's description than do v. Graff's, and they 

 come from the same place as Johnston's original. I think, 

 then, that I am justified in claiming that while my specimens 

 do belong to Johnston's species, v. Graff's do not. 



It remains to try to settle the name of v. Graff's species. 

 Now, the specimens which he examined were (i) American 

 specimens, and (2) Hansen's original ''Spinthcr arctic2is'' 

 These he decided to unite in the one species, which he, 

 doubtfully however, identified with Johnston's 5. oiiiscoides. 

 Though Stimpson's original Cryptoiiota citrina had been 

 destro3'ed in the great Chicago fire, yet ^>rrill pronounced 

 these American specimens to belong to Stimpson's species. 

 Von Graff says that in response to his enquiry he was informed 

 that Verrill was well acquainted with " Cryptonota citriiia^' 

 which was found in a spot near to the Bay of Fundy, and 

 these specimens were forwarded by Verrill. 



Stimpson's description is, unfortunately, too meagre to do 

 more than show that his specimen belonged to the genus 



